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#ifndef _LINUX_VIRTIO_BLK_H

#define _LINUX_VIRTIO_BLK_H

#include <linux/virtio_config.h>

/* The ID for virtio_block */

#define VIRTIO_ID_BLOCK 2

/* Feature bits */

#define VIRTIO_CONFIG_BLK_F     0x40

#define VIRTIO_BLK_F_BARRIER    1       /* Does host support barriers? */

/* The capacity (in 512-byte sectors). */

#define VIRTIO_CONFIG_BLK_F_CAPACITY    0x41

/* The maximum segment size. */

#define VIRTIO_CONFIG_BLK_F_SIZE_MAX    0x42

/* The maximum number of segments. */

#define VIRTIO_CONFIG_BLK_F_SEG_MAX     0x43

/* These two define direction. */

#define VIRTIO_BLK_T_IN         0

#define VIRTIO_BLK_T_OUT        1

/* This bit says it's a scsi command, not an actual read or write. */

#define VIRTIO_BLK_T_SCSI_CMD   2

/* Barrier before this op. */

#define VIRTIO_BLK_T_BARRIER    0x80000000

/* This is the first element of the read scatter-gather list. */

struct virtio_blk_outhdr

{

        /* VIRTIO_BLK_T* */

        __u32 type;

        /* io priority. */

        __u32 ioprio;

        /* Sector (ie. 512 byte offset) */

        __u64 sector;

        /* Where to put reply. */

        __u64 id;

};

#define VIRTIO_BLK_S_OK         0

#define VIRTIO_BLK_S_IOERR      1

#define VIRTIO_BLK_S_UNSUPP     2

/* This is the first element of the write scatter-gather list */

struct virtio_blk_inhdr

{

        unsigned char status;

};

#endif /* _LINUX_VIRTIO_BLK_H */